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近年来,苏联及世界其它国家在改造和制造新的(?)及(?)轧机,改进轧制工艺方面均做了大量工作。最有效的措施是:制造高速长行程(?)轧机;制造多线(?)轧机(主要用于轧制有色金属和碳钢)和(?)轧机;研制温轧耐腐蚀钢管及其它合金钢管的方法及设备;采用在工作机架正反行程之前进行坯料的回转和送进的方法;研究新的轧制工具的孔型设计,尤其是曲线心棒;研制同时有两对轧辊串联布置的周期式轧制方法及设备。此外,苏联还正在进行连续冷轧管工艺和设备及固定机架的周期式冷轧管(?)工艺的研究。轧辊工作部分(孔型)长度是(?)轧机的主要参数之一,它决定轧机生产力、管材质
In recent years, the Soviet Union and other countries in the world have done a great deal of work in reforming and manufacturing new rolling mills and rolling mills. The most effective measures are: manufacturing high-speed long-stroke (?) Rolling mill; manufacturing multi-line rolling mills The method and the equipment are adopted; the method for rotating and feeding the billet before the positive and the negative stroke of the working frame is researched; the hole type design of the new rolling tool is studied, in particular the curve mandrel; a cycle with two pairs of rollers arranged in series Rolling method and equipment. In addition, the Soviet Union is also conducting continuous cold-rolled tube technology and equipment and fixed rack cycle cold-rolled tube (?) Process. Roller working part (hole) length is (?) Mill one of the main parameters, which determines the mill productivity, pipe material